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EL34 push pull DIY project
Submitted by costas sarris on Thu, 28/08/2008 - 12:00.
EL34 amp project by Giannis Spathopoulos
This is Giannis Spathopoulos EL34 amp push pull diy latest project. It is a classic push pull amp design .
It is an ultra linear mode PP amp uses the EF86 (voltage gain) and the 6FQ7 (phase splitter )tubes at the driving stage. The output transformers are hand made (P&K audio). We build this amp in a ready-made chassis.It is all hard wired using silver Teflon cables in all critical paths. Listening this amp our first impression was very good. It has really excellent performance.
After some testings we publish the first draft schematic. Note that we apply no feedback at all. The plate-to-plate loading of the output stage is 5k Ohms and, the line voltage is 430 Volts. The Bias applied voltage is -47Volts ( -35V grid).
Input sensitivity measured at 1kHz is about 7.5 mV for an output of approximately 25 W with no feedback. Total harmonic distortion is about 1% when no feedback is applied.
Measurements and , data will be available soon.
We continue testing it and listening to it performing the necessary fine tuning.
Find a similar project by clicking here
Giannis Spathopoulos
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Hello, As drawn above on
Hello,
As drawn above on your webpage the phase splitter in the EL34 amplifier would not work. The 6FQ7 lowest in the drawing has an earthed grid (as far as audio is concerned) and the cathode is earthed through 100Kohms, so it has no signal input. The amplifier will still operate but at a lower power as one EL34 is not driven. My guess is that the cathodes of the two 6FQ7 sections should be linked.
regards,
Marcus.
its a classic long tail pair
its a classic long tail pair set up for a singal polarity power supply ie the second grid is grounded for audio via the cap to earth the grids are linked via the 1M resistor
balance is acheved by the valuses of the two plae resitors being different , I cant see the values but 100 and 82 k would be typical
it will work ok
Am I Stupid?(probably) I
Am I Stupid?(probably)
I don't see any phase split in this circuit.
Is it done at the opt?
How can this be push pull?
Please enlighten me!
R.
6FQ7 is the splitter costas
6FQ7 is the splitter
costas
Im linking this for my
Im linking this for my friend, he is going crazy about this projects, personally i dont have any idea about whats going on here, buut he seems very interested and your articles likes him a lot.
Good post, keep up the good
Good post, keep up the good work:）
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